Read threshold voltage selection
AssigneeMicron Technology, Inc.
InventorChandra C. Varanasi
Life of this patent
Estimating the term…
Abstract
Apparatuses and methods for read threshold voltage selection are provided. One example method can include setting a first soft read threshold voltage and a second soft read threshold voltage based on a difference between a first number of memory cells that are read as being programmed to a first state when read using a first threshold voltage and a second number of memory that are read as being programmed to the first state when read using another threshold voltage.
Claims20
An apparatus for read threshold voltage selection, comprising:
- an array of memory cells;
- and
- a controller coupled to the array of memory cells, the controller configured to:
- set a first soft read threshold voltage;
- set a second soft read threshold voltage, wherein a difference between the first soft read threshold voltage and a hard read threshold voltage is the same as a difference between the second soft read threshold voltage and the hard read threshold voltage;
- perform a soft read operation using the first soft read threshold voltage and the second soft read threshold voltage;
- and
- update the first soft read voltage and the second soft read threshold voltage for subsequent soft read operations based on results of the soft read operation.
An apparatus for read threshold voltage selection, comprising:
- an array of memory cells;
- and
- a controller coupled to the array of memory cells, the controller configured to:
- calculate a hard read threshold voltage;
- set a first soft read threshold voltage based on the hard read threshold voltage;
- set a second soft read threshold voltage based on the hard read threshold voltage, wherein a difference between the first soft read threshold voltage and the hard read threshold voltage is the same as a difference between the second soft read threshold voltage and the hard read threshold voltage;
- perform a soft read operation using the first soft read threshold voltage and the second soft read threshold voltage;
- and
- update the first soft read voltage and the second soft read threshold voltage for subsequent soft read operations based on results of the soft read operation.
A method for read threshold voltage selection, comprising:
- setting a first soft read threshold voltage as a first offset from a hard read threshold voltage;
- and
- setting a second soft read threshold voltage as a second offset from the hard read threshold voltage, wherein the first offset and the second offset are equal;
- performing a soft read operation using the first soft read threshold voltage and the second soft read threshold voltage;
- and
- updating the first soft read voltage and the second soft read threshold voltage for subsequent soft read operations based on results of the soft read operation.
Dependencies are inferred from the claim text.